#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
int main()
{
	int a = 0;
	scanf("%d",&a);
	for (int i = 0; i < a; i++)
	{
		for (int j = 0; j < a; j++)
		{
			if (i == 0 || i == a - 1)
				printf("* ");
			else if (j == 0 || j == a - 1)
				printf("* ");
			else
				printf("  ");
		}
		printf("\n");
	}
	return 0;
}